What is the author's style in Neverwhere by Neil Gaiman?

The world of London Below is marked by a literalization of London's place-names. Earls Court, for example, one of London's inner city districts, is an actual medieval court in London Below, complete with earl, jester and attendants. This pattern extends to homonyms as well. Knightsbridge becomes Night's Bridge in the Below, a bridge of absolute darkness and nightmares. This pattern suggests that the reality of London Below is susceptible to metonymic associations. In essence, London Below is, in part, created by an understanding of language.